212137721704 has 64 divisors (see below), whose sum is σ = 423103338000. Its totient is φ = 99368730624.

The previous prime is 212137721701. The next prime is 212137721707. The reversal of 212137721704 is 407127731212.

212137721704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (212137721701) and next prime (212137721707).

It can be written as a sum of positive squares in 8 ways, for example, as 190272184804 + 21865536900 = 436202^2 + 147870^2 .

It is not an unprimeable number, because it can be changed into a prime (212137721701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38928772 + ... + 38934220.

Almost surely, 2^212137721704 is an apocalyptic number.

It is an amenable number.

212137721704 is a deficient number, since it is larger than the sum of its proper divisors (210965616296).

212137721704 is a wasteful number, since it uses less digits than its factorization.

212137721704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6742 (or 6738 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The spelling of 212137721704 in words is "two hundred twelve billion, one hundred thirty-seven million, seven hundred twenty-one thousand, seven hundred four".